Take for instance Pleroma: Everything you can think if is configurable 1. You can control uploads , CDN/s3 2. MRF rules to filter the relay from bad domains to keywords, 3. Set Retention policies for local and federated posts 4. Media Proxy 5. Rate limiters 6. SMTP mailers 7. Administrative GUI 8. A job queue so you never miss posts, very efficient federation compared to nostr 9. Search Plugins